Penelope O'Brien

Parents

• Slany O'Brien
• Donnell O'Brien

Children

Siblings

• Sir Terlough O'Brien
• Donogh O'Brien
• Connor O'Brien
• Thomas FitzMaurice, 12th Baron of Kerry and Lixnaw
• Edmond FitzMaurice, 11th Baron of Kerry and Lixnaw
• Aine O'Brien
• Murtough O'Brien
• Margaret O'Brien
• Sawney O'Brien
• Móre O'Brien
• Honora O'Brien
• Teig O'Brien

Partners

• Thomas Fitzmaurice, 16th Baron Kerry